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<!----------------------------------------------------------

	Copyright (c) 2018 Jean-Marc VIGLINO,
	released under CeCILL-B (french BSD like) licence: http://www.cecill.info/

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<head>
	<title>ol-ext: Clustering map</title>
	<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
	<meta name="description" content="A cluster layer for OpenLayers (ol/ol3) that animates clusters on zoom change." />
	<meta name="keywords" content="ol3,cluster,charts,animation,layer,selectio,animate,animated clusters,openlayers" />

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  <script src="https://cdn.polyfill.io/v2/polyfill.min.js?features=requestAnimationFrame,Element.prototype.classList,URL,Object.assign"></script>
	
	<!-- ol-ext -->
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	<style>
		.infos > i {
			float: left;
			font-size: 3em;
			margin: -.2em 0 -.2em -.2em;
		}
		[class^="maki-"]:before, [class*=" maki-"]:before {
			width: initial;
		}
	</style>

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	<a href="https://github.com/Viglino/ol-ext" class="icss-github-corner"><i></i></a>

	<a href="../../index.html">
		<h1>ol-ext: Clustering map</h1>
	</a>
	<p class="info">
		This example show the use of the <i>ol.style.Chart</i> to display the cluster content.
	</p>

	<!-- DIV pour la carte -->
	<div id="map" style="width:600px; height:400px;"></div>

	<div class="options">
		<h2>
			Cluster options:
		</h2>
		<input id="animatecluster" type="checkbox" checked="checked" onchange="clusterLayer.set('animationDuration',(this.checked ? 700:0));" />
		<label for="animatecluster">animate cluster</label>
		<br />
		Number of features:
		<br/>
		<input type="number" value="2000" onchange="addFeatures(this.value);" />
		<h2>Select options:</h2>
		<input id="animatesel" type="checkbox" checked="checked" onchange="selectCluster.animate = this.checked" />
		<label for="animatesel">animate selection</label>
	</div>
	<div class="infos">
		<!-- preload icon -->
		<i class="fa maki-bus" title="building"></i>
		<i class="fa maki-town_hall" title="building"></i>
		<i class="fa maki-theatre" title="building"></i>
		<i class="fa maki-industrial" title="building"></i>
	</div>

	<script type="text/javascript">
  // Layers
  var layers = [ new ol.layer.Tile({
    source: new ol.source.OSM()
  })];

  // The map
  var map = new ol.Map({
    target: 'map',
    view: new ol.View({
      zoom: 4,
      center: [166326, 5992663]
    }),
    layers: layers
  });

  // Addfeatures to the cluster
  function addFeatures(nb) {
    var ext = map.getView().calculateExtent(map.getSize());
    var features=[];
    for (var i=0; i<nb; ++i) {
      features[i] = new ol.Feature(new ol.geom.Point([ext[0]+(ext[2]-ext[0])*Math.random(), ext[1]+(ext[3]-ext[1])*Math.random()]));
      features[i].set('id',i);
      features[i].set('type', Math.floor(Math.random()*4))
    }
    clusterSource.getSource().clear();
    clusterSource.getSource().addFeatures(features);
  }

  // Style for the clusters
  var styleCache = {};
  function getStyle (feature, resolution) {
    var features = feature.get('features');
    var size = features.length;
    // Feature style
    if (size===1) return featureStyle(feature);
    // ClusterStyle
    else {
      var data = [0,0,0,0];
      for (var i=0, f; f=features[i]; i++) data[f.get('type')]++;
      var style = styleCache[data.join(',')];
      if (!style) {
        var radius = Math.min(size+7, 20);
        style = styleCache[data.join(',')] = new ol.style.Style({
          image: new ol.style.Chart({
            type: 'pie', 
            radius: radius, 
            data: data, 
            rotateWithView: true,
            stroke: new ol.style.Stroke({
              color: "rgba(0,0,0,0)",
              width: 0
            })
          })

        });
      }
      return [style];
    }
  }

  // Style for the features
  var form = ['bus', 'town_hall', 'theatre', 'industrial'];
  function featureStyle(f) {
    var sel = f.get('features')
    if (sel) {
      var type = sel[0].get('type');
      var style = styleCache[type];
      if (!style) {
        var color = ol.style.Chart.colors.classic[type];
        style = styleCache[type] = new ol.style.Style({
          image:  new ol.style.FontSymbol({
            glyph: 'maki-'+form[type],
            radius: 12,
            color: color,	
            fill: new ol.style.Fill({
              color:color
            }),
            stroke: new ol.style.Stroke ({
              color: '#fff',
              width: 1
            })
          })
        });
      }
      return [style];
    }
    else return [ new ol.style.Style({
      // Draw a link beetween points (or not)
      stroke: new ol.style.Stroke({
        color:"#fff", 
        width:1 
      }) 
    })];
  }

  // Cluster Source
  var clusterSource=new ol.source.Cluster({
    distance: 40,
    source: new ol.source.Vector()
  });
  // Animated cluster layer
  var clusterLayer = new ol.layer.AnimatedCluster({
    name: 'Cluster',
    source: clusterSource,
    animationDuration: $("#animatecluster").prop('checked') ? 700:0,
    // Cluster style
    style: getStyle
  });
  map.addLayer(clusterLayer);
  // add 2000 features
  addFeatures(2000);
  
  // Select interaction to spread cluster out and select features
  var selectCluster = new ol.interaction.SelectCluster({
    // Point radius: to calculate distance between the features
    pointRadius:10,
    animate: $("#animatesel").prop('checked'),
    // Feature style when it springs apart
    featureStyle: featureStyle,
    selectCluster: false,	// disable cluster selection
  });
  map.addInteraction(selectCluster);

  // On selected => get feature in cluster and show info
  selectCluster.getFeatures().on(['add'], function (e){
    var c = e.element.get('features');
    if (c.length==1) {
      var feature = c[0];
      var color = ol.style.Chart.colors.classic[feature.get('type')];
      $(".infos").html(
        "<i class='maki-"+form[feature.get('type')]+"' style='color:"+color+"'></i>"+
        "One feature selected...<br/>(type="+form[feature.get('type')]+")"
      );
    } else {
      $(".infos").text("Cluster ("+c.length+" features)");
    }
  })
  selectCluster.getFeatures().on(['remove'], function (e) {
    $(".infos").html("");
  })

  function testFontLoaded () {
    console.log('TEST', $(".maki-bus").width())
    // Loaded ?
    if ($(".maki-bus").width() > 60) {
      styleCache = {};
    } else {
      setTimeout(testFontLoaded,100);
    }
  }
  testFontLoaded ();

	</script>

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